Gravedig, gravedig
So yeah, I do not have a line or phrase for picking up but I have done a pretty cute thing with a girl(I have actually done this with every cute girl I could meet on the road that day lol).
I made a self-video where I said that I saw her walking down the street few times and I found her really cute, and that I'm really shy to ask for her number looking into her eyes.
I showed this video to 10 girls which I've met just walking randomly in Bologna. Did it have any success? I'd say yes, 6 girls of 10 left me their phone numbers and we also got out I took this idea from some italian YouTube prank-stars, and it worked well.
Girls were like "Ohh what a cute thing :3", "Are serious? Because if so this was best approach I've ever seen" and many other reactions, I was like "OMG GODLIKE" whole week lol.